CMake (3.11.3) error in evaluation files cmdtransport and cmdlog

[osrf-migration]

Original report (archived issue) by Jose Luis Rivero (Bitbucket: Jose Luis Rivero, GitHub: j-rivero).

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The Window build using cmake (3.11.3) detected an error with multiple evaluation of a generated configuration files in test/lib/ruby/ignition/cmdtransport5.rb and test/lib/ruby/ignition/cmdlog5.rb. I can not find were is the origin of the multiple evaluation but if I comment the file generate command the error is gone (bbdccb410b6ac63fb7174ca346739358f36a4396).

https://build.osrfoundation.org/job/ign_gui_win/25/consoleFull

CMake Error in src/cmd/CMakeLists.txt:
  Evaluation file to be written multiple times with different content.  This
  is generally caused by the content evaluating the configuration type,
  language, or location of object files:

   D:/Jenkins/workspace/ign_gui_win/ws/build/ignition-transport5/test/lib/ruby/ignition/cmdtransport5.rb

CMake Error in log/src/cmd/CMakeLists.txt:
  Evaluation file to be written multiple times with different content.  This
  is generally caused by the content evaluating the configuration type,
  language, or location of object files:

   D:/Jenkins/workspace/ign_gui_win/ws/build/ignition-transport5/log/test/lib/ruby/ignition/cmdlog5.rb